Request to Add functionality to Allow Running of overloaded method unless alternate return set

[Robert Wlaschin]

Sometimes it's super useful to stub out a function for particular calls.

Take the fs.readFileSync function.  This might be used in a program to load a config file which would be useful to stub to ensure the the config file is validated properly and returns the correct responses .. etc . However, require() uses fs.readFileSync to load the JS files.  So stubbing this function outright would not be possible.

For business reasons it might not be feasible to rewrite classes/modules to expose these functions so it would be nice to provide a similar feature.

function SinonWrapper(context,property) {

// Creates a stub that by default calls the original

var stub = Sinon.stub(context,property);

stub.callsFake( function() {

// console.log(arguments)

return stub.wrappedMethod.apply(context,arguments)

})

return stub

}

// Usage ....

fs.existsSync = SinonHelper.wrap(fs,"existsSync")

fs.existsSync

.withArgs("/etc/zde.conf").returns(true)

.withArgs("./config/test0.test1.test2.json").returns(true)

fs.readFileSync = SinonHelper.wrap(fs,"readFileSync")

fs.readFileSync

.withArgs("/etc/zde.conf").returns(

// role is a value that changes what is loaded!

"{\"role\" : \"test\","

+"\"region\" : \"test\","

+"\"placement-availability-zone\" : \"test\","

+"\"instance-id\" : \"test\","

+"\"region-config\" : \"test0.test1.test2.js\"}"

)

.withArgs("./config/test0.test1.test2.json").returns(

"{ \"rtb\":{ \"activeDSPIDs\": [], \"activeSSPIDs\" : [] }, \"dsps\" : { \"testdsp\" : {} }, \"ssps\" : { \"testssp\" : {}} }"

)

.withArgs("./config/server.json").returns(

"{}"

)

.withArgs("./config/redis.test1.json").returns(

"{ \"dsp\" : { \"list\" : [], \"connections\" : [] },"

+"\"uuid\" : { \"list\" : [], \"connections\" : [] },"

+"\"cache\" : { \"list\" : [], \"connections\" : [] }, "

+"\"userSegments\" : { \"list\" : [], \"connections\" : [] } "

+"}"

)